2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/35723We consider an inflationary model inspired in the low energy limit of string theory. In this model, the scale factor grows exponentially with time. A perturbation study is performed, and we show that there is a mode which displays an exponential growth in the perturbation of the scalar field.8 pages, latex fileGeneral Relativity and Quantum Cosmologytext